Magnetic field modulated exciton generation in organic semiconductors: An intermolecular quantum correlated effect
Magnetic field modulated exciton generation in organic semiconductors: An intermolecular quantum correlated effect
复制标题
有机半导体中磁场调制激子的产生：分子间量子相关效应
DOI：
10.1103/physrevb.82.205209
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发表时间：
2010-11-17
影响因子：
3.7
通讯作者：
Hou, Xiaoyuan
中科院分区：
文献类型：
--
作者：
Ding, Baofu;Yao, Yao;Hou, Xiaoyuan
采用由空穴传输材料和电子传输材料组成的混合发光层，对有机半导体的磁致发光进行了实验调谐。基于Hubbard模型的理论与实验结果吻合较好，揭示了两个发现：（1）在低场和高场区，自旋散射和自旋混合分别主导MEL。(2)混合比以及由此的迁移率决定了在给定磁场中EL的相对变化的值。最后，我们成功地预言了在低场作用下，单重态激子的数量增加，而三重态激子的布居数变化不大，进一步证实了第一个发现。
Magnetoelectroluminescence (MEL) of organic semiconductor has been experimentally tuned by adopting blended emitting layer consisting of hole transporting material and electron transporting material. Theory based on Hubbard model fits experimental MEL well, which reveals two findings: (1) spin scattering and spin mixing, respectively, dominate MEL in low-field and high-field region. (2) Blended ratio, and thus the mobility, determines the value of the relative change in the EL in a given magnetic field. Finally successful prediction about the increase in singlet excitons in low field with little change in triplet exciton population further confirms the first finding.